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Evolution of the spectral lineshape at the magnetic transition in Sr\(_2\)IrO\(_4\) and Sr\(_3\)Ir\(_2\)O\(_7\)

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Abstract

Sr\(_2\)IrO\(_4\) and Sr\(_3\)Ir\(_2\)O\(_7\) form two families of spin-orbit Mott insulators with quite different charge gaps and an antiferromagnetic (AF) ground state. This offers a unique opportunity to study the impact of long-range magnetic order in Mott insulators. It appears to play a different role in the two families, as there is almost no change of the resistivity at the magnetic transition \(T_N\) in Sr\(_2\)IrO\(_4\) and a large one in Sr\(_3\)Ir\(_2\)O\(_7\). We use angle-resolved photoemission to study the evolution of the spectral lineshape through the magnetic transition. We use Ru and La substitutions to tune \(T_N\) and discriminate changes due to temperature from those due to magnetic order. We evidence a shift and a transfer of spectral weight in the gap at \(T_N\) in Sr\(_3\)Ir\(_2\)O\(_7\), which is absent in Sr\(_2\)IrO\(_4\). We assign this behavior to a significantly larger coherent contribution to the spectral lineshape in Sr\(_3\)Ir\(_2\)O\(_7\), which evolves strongly at \(T_N\). On the contrary, the Sr\(_2\)IrO\(_4\) lineshape is dominated by the incoherent part, which is insensitive to \(T_N\). We compare these findings to theoretical expectations of the Slater vs Mott antiferromagnetism within dynamical mean field theory.

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The datasets generated during and/or analysed during the current study are available from the corresponding author on reasonable request.

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Authors and Affiliations

  1. Université Paris-Saclay, CNRS, Laboratoire de Physique des Solides, 91405, Orsay, France

    Paul Foulquier, Marcello Civelli, Marcelo Rozenberg & Véronique Brouet

  2. Université Paris-Saclay, CEA, CNRS, SPEC, 91191, Gif-sur-Yvette, France

    Paul Foulquier, Dorothée Colson & Anne Forget

  3. Departamento de Física, FCEN, UBA, and IFIBA, CONICET, Pabellón 1, Ciudad Universitaria, 1428, Buenos Aires, Argentina

    Alberto Camjayi & Joel Bobadilla

  4. Université Paris-Saclay, CEA, CNRS, NIMBE, 91191, Gif-sur-Yvette, France

    Pierre Thuéry

  5. Synchrotron SOLEIL, L’Orme des Merisiers, Saint-Aubin-BP 48, 91192, Gif-sur-Yvette, France

    François Bertran & Patrick Le Fèvre

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Contributions

PF, FB, PLF, and VB performed ARPES experiments. MC, MR, AC, and JB performed the calculations. PF, VB, DC, AF, and PT synthesized and characterized the samples. PF, VB, and MC wrote the manuscript, with feedbacks from all authors.

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Correspondence to Véronique Brouet.

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Foulquier, P., Civelli, M., Rozenberg, M. et al. Evolution of the spectral lineshape at the magnetic transition in Sr\(_2\)IrO\(_4\) and Sr\(_3\)Ir\(_2\)O\(_7\). Eur. Phys. J. B 96, 42 (2023). https://doi.org/10.1140/epjb/s10051-023-00512-3

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